Keystones



w. KosFELD 1,788,837

PROCESS FR THE MANUFACTURE 0F PIPE SHELVES,

KEYSTONES, RING` STONES, AND LIKE ARTICLES Filed Sept. '26. 1927 2 Sheets-Sheet l lmgls, 1931 armen/ey 1,788,83 MANUFACTURE 0F PIPE SHELVES, RING STONES 2 Sheets-Sheet 2 Jan. 13, 1931. w KQSFLD PROCESS FOR THE KEYsToNEs AND LIKE ARTICLES Filed Sept N/U/EL KOSFELD ATTMYEY WILHELM KOSFNLD; or DORTMUND, GERMANY; uiSsI-GNONl yTo 'vEiIEINIefTnv STAND! burning,

' sectionsorl piping, i Y n keystones', annular and) profile stones and- WERKE AKTIENGESELLSCHAFT, `on DUSSELDORF, eriiiniiieiv'vV PROCESS Non TIIii yii/AIANUFncT.UND or PIPESIIEDIIns', IIExSToNESg-RINesTONiiis' ND *NLIKE ARTICLES i* Application/filed September 26, 192'?,y Serial I This inventionrelates to a process forthe 'manufacture of pipe shelves'such asare re- Y' for the insulation of pipe ory for the manufacture of quired for instance bricks for refractory `and other purposes.

Asisfwell known; owing tothe process of moulded articles especially;L hollovvV cylindrical or conical segments of'the exact dimensions in the first instance.

This is very expensive, orinferior Worklhas tothe put up with. Irregular; andconside'r- Sible byian apparatussuitable to be used to make economically such articles,

' curacy hitherto unknown, Which has a favourable effect in every respect.V

l -The invention consiststin a combination of ceramical 'andmachining measures whereby f such articles, the". accurate sizing"l or 'adj ustving of which is first l'advisable at theplace of i use, are produced'by first moulding-and then I burning themrvvitha supply of so much more Yau material thanevvill-be necessary for the finishedproduct tliatfit is 'possible to obtain ofthe peripheral profiles closed in themselves,

-Whereuponf these peripheral lprofiles are vvorked'to the exact measurements onagrindingor milling machine.

IA further feature of Y the facesof theiarticles, being kmoulded and angularly located finally vburned With voversize dimensions,l are eralprofiles clamping the Work.Vv

. an abrasive i in 'that said articles i being moulded and finally burned vvithoversize dimensions'and then rel y -volvedy abont'a'horizvontalaxis in contact WithV surface revolving'aboutf a second axis, which itfis ,impossibleto. makefsucli'k Consequently the 'articles'must be trimmed at the placeof use.V

the. invention is that ,with respect to the periph- -f u closed in themselves and are firstV f ground forthe purpose of obtaining faces for d axis may kbe varied With re-y f l spect tothe first mentioaedaxs to'gve a defi-Q No 222,176; and in Octolier l1Q "7."1 l i positionlof thejto'ol spindleV Whilst 'rotatingfV i `An embodiment ofan la-pparatu's Vsuitable 'nite `simpa @deze ,te said karticles revel-ving *551 if; 1 t'heswivelling tool'betiv'eenjrevoluble plates i V d l rotatable'tenngletsfon the @spindles ,y of'sa-idplate's' orjj avvs regulating the vertical V 'tobef usedfor" thev manufacture vof'fperiph- Y eralffprofiles: closed injthemselvel's isgiveii difagranimaticl rdraivings,'vvlierein ,Figure l l is aside elevation; Figure; 2 v'is longitudinal @lemon-"W scale:l

fand 'c which attli sam-e time form bearings; 4

lnthe bracketc'is mounteda' Worm drive d, "1 l i i lthefvvorm shaftcl'isnotishown "1ninterest of clearIIeSS;

ln the Worin ,-Wh'efel .c-is provided a bush orsleeve fvvhich passes Y through. thefupper part of thebraclet'cz In .j

'thesl'eeve :is mounted an adjustable 'spindle 'g `Which is-free-torevolve andfoi'i fvvhichffis v l"mounted aitemplate holderh withthe Vtlvrlif-v Y, economically an accuratemachine finishing i plaitez'lg'Inthejbr'aclet'b,mounteda'simple1 'if spindlefk rvWith the loc-king device `Z therefor; Y

a clamping plate exchanged to jf-'If "circumstanc pl'atesican or mina position axial -to` the.y grinding-roller fagby means yof fconnectingbolt's lo?. 4

"The templates .z' are shown only shape vl`of the articles. i the Workzr Figure continued revolutionr4 .of the Thereby veryssharp' edges :are obtained.

l d sideivew but they mayhave anyl'suitableperipheral d, i guiding surface depending on` thedeSired'- The'vvhole prole of `L. 1)'is ground durin'g'one w i p vvorlr.togetheifA g.;- with the simultaneousrevoluti'on :of: the tem-5 Y ,j .A plates vvhilevv the tablefis moved respectively.- a

50 abouta horizontalaxis in lContact,Witlian abrasive surface revolving L about a second 'f suchlarticles, the accurate sizing of Whichgis i crank p of the rotating device and movement of the transporting table a, the lattervvvith itsrparts and With the Work piece held lbe- ,tweenv the jaws m will be advanced towards Y the grindingroller mwhereby the,V adjustable templates are pressed against the roller'srg. As the Whole grinding part of the appara-V tus is adjustable, and the fork carrying the grindigrroller ishiovable in the'fhorizontal as Well as in the vvert-icalplane, the grinding'.

roller Willv eas N lines and curves ofthe temp-lates. Y

Instead of the manually7 operated crankv p,

a power. drive with gearing can beprovided.

` It is advisable to grindthe end facesbf the articles before .the introductionintothe ly andl accurately follow the apparatus, so as tofacilitate the iizing.

- What I ,claim andl desire to; secure Vby Letters Patents of .the United States is: i

Y 1'. 'A process vfor the manufacture of, pipe shelves, keystones, annular stones andV bricks.l consisting in first moulding andthen burning first advisableat-the place einse, with Va supply of so much more materialthan will be i necessary for the finished product rthat it is possible to obtain economically inaccurate vmachine inishing'of the peripheral profiles closed in themselves, whereupon theseperiph ments by machine grinding. y Y

, 2. A process Vfor themanufacture of pipe shelves, keystones, annular stones-and bricks,

eral proles are VWorked to theexact measure-, '.1

consisting in irst moulding andthen burn- 1 ing such articles, the accurate sizingof which isirst advisable at Jthe place ofuse, With a supply of so much more material than Will be necessary for the finished product that' it is possible to'obtain Veconomically an accurate machine finishingA of the peripheral profiles closed in themselves, whereupon at first-the `faces of saidy articles beinfr locatedranvula'rl f C9 t; v

`tothe peripheralproiles Yclosed in 'themselves j are 'ground for obtaining clamping faces and Y l thenthe peripheral prciles are Worked to the exact measurements-by machine grinding.

Y 3. A processiffor manufacture Y of 4pipe shelves, keystones, annularv stones andbrlcks,

said articles beingmouldeda'nd then lburned Y with oversize dimensions, being rthen revoi-ved axis, which axis maybe'varied vvithjrespect to the. first mentioned axis to give a definite thereonshape and size 'to WILHELM K OVjSFELD.

said articles'revolvingv 

